4x Memory Card

From Sega Retro

DC4xMC DC.jpg
4x Memory Card
Made for: Sega Dreamcast
Manufacturer: Sega
Type: Memory card
Release Date RRP Code
Sega Dreamcast
¥2,500 (2,625)2,500 (2,625)[2] HKT-4100
Sega Dreamcast
(Phantasy Star Online)
Sega Dreamcast

The Dreamcast 4x Memory Card, known as the Memory Card 4x (メモリーカード 4X) in Japan, is the official alternative to a VMU for saving on a Sega Dreamcast.


It is a device that holds 800 blocks of memory as opposed to the standard 200. The Dreamcast, however, can only understand memory cards with 200 blocks, so the data is divided into four "pages". There is a switch on the unit used to access the other 600 blocks, and LEDs to inform the user which set of data they are currently using. Switching tricks the Dreamcast into thinking a different VMU has been inserted, but means you can only access 200 blocks at a time.

There are some slight annoyances - due to its design, if a user saves on the fourth set of save blocks, he or she will be required to press the button three times shortly after booting up the console, as the device will always default to the first set. There is also no screen or buttons, so you can't take advantage of VMU-specific features. On the plus side, it does not require its own battery and so will never "squeak" when the system is turned on.


Incompatible games

A number of earlier Dreamcast games do not function correctly with the 4x Memory Card[5][6], with some crashing when attempting to access the device, and others failing to detect the card at all.

Games which do not recognise the 4x Memory Card

Games which do not support in-game page switching

Other issues

ASCII's range of accessories, the ASCII Pad FT, ASCII Stick FT and ASCII Mission Stick are not compatible as the 4x Memory Card does not physically fit.


There 4x Memory Card was rolled out across Japan and North America (including a Phantasy Star Online branded one for Japan). No official 4x Memory Cards made it to Europe but there are many unofficial alternatives.

Localised names

Also known as
Language Localised Name English Translation
English 4x Memory Card 4x Memory Card
Japanese メモリーカード 4X Memory Card 4x

Magazine articles

Main article: 4x Memory Card/Magazine articles.

Photo gallery

Physical scans

Dreamcast, JP
DC4xMC DC JP Box Front.jpg
Dreamcast, JP (Phantasy Star Online)
MemoryCard4X DC JP Box Back PSO.jpgNospine-small.pngMemoryCard4X DC JP Box Front PSO.jpg
Dreamcast, US
4X Memory Card Back.jpgNospine-small.pngDC4xMC DC US Box Front.jpg

External links

  • Sega of Japan catalogue pages (Japanese): Dreamcast


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